🇮🇷 Iran · Hydraulic works
Band-e Darreh — Arch Dam of Birjand
Qajar to Pahlavi (1910–1930) · Qajar Persian garden culture (Birjand Alam dynasty)
1910 Qajar 12-m arch 35 m on Darreh valley feeding Birjand Akbariye Persian garden and Arg via 2 km qanat.